TABLE 1.
Integrons in Salmonella serovar Paratyphi B dT+ strains
| No. of strains | Yrs of isolation | Antibiotic resistancea | Integron (cassettes/locationb)
|
Profilec
|
||
|---|---|---|---|---|---|---|
| Class 1 | Class 2 | PFGE | IS200 | |||
| Multiresistant strains of the predominating clone | ||||||
| 81 | 1995-2001 | TMP, SPE, STR, SMX, NAL, AMP, KAN-NEO | dfrA1-sat1-aadA1/C | X8 | ISP9 | |
| 4 | 1995-2001 | TMP, SPE, STR, SMX, TET, NAL, AMP, GEN | dfrA1-aadA1/P or aadA1/P | dfrA1-sat1-aadA1/C | X8 | ISP9 |
| Comparative strains | ||||||
| 5 | 1994-1999 | TMP, SPE, STR, SMX, TET, NAL, CHL, KAN-NEO | dfrA12-aadA2/P | X7 | ISP8 | |
| 9 | 1960-1993 | Sensitive | X1-X6 | ISP1-ISP7 | ||
a
Boldface indicates resistance exhibited by all strains, and lightface indicates resistance exhibited by only some strains. Abbreviations: TMP, trimethoprim; SPE, spectinomycin; STR, streptomycin; SMX, sulfamethoxazole; NAL, nalidixic acid; AMP, ampicillin; KAN-NEO, kanamycin-neomycin; TET, tetracycline; GEN, gentamicin; CHL, chloramphenicol.
b
P, high-molecular-weight plasmid; C, chromosome.
c
Assignment according to reference 18. X, XbaI; ISP, IS200 profile.